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Exactly as Carlton posted, use a spirit level on the top face of the tripod before you put the mount head on. I go in two directions at right angles. One across the two legs adjacent to or opposite the aligning dowel (Depending which side you have that on) and then once at 90 degrees to that. In my experience the built in level is not all that accurate.
After all that though, it depends on how you are using the mount, if you are using it in alt-az mode then it is important to have it accurately levelled, goto and tracking accuracy will be better. If you are in EQ mode and doing a polar alignment it is less important as you can align that out when doing your polar alignment.
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